/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.transforms.windowing;



import com.bff.gaia.unified.vendor.guava.com.google.common.base.Objects;

import org.joda.time.Instant;



import java.util.List;



/**

 * <i><b>FOR INTERNAL USE ONLY</b></i>. A trigger that fires after synchronized processing time has

 * reached the processing time of the first element's arrival.

 *

 * <p>This is for internal, primarily as a "continuation trigger" for {@link AfterProcessingTime}

 * triggers. In that use, this trigger is ready as soon as all upstream workers processing time

 * clocks have caught up to the moment that input arrived.

 */

public class AfterSynchronizedProcessingTime extends Trigger.OnceTrigger {



  public static AfterSynchronizedProcessingTime ofFirstElement() {

    return new AfterSynchronizedProcessingTime();

  }



  private AfterSynchronizedProcessingTime() {

    super(null);

  }



  @Override

  public Instant getWatermarkThatGuaranteesFiring(BoundedWindow window) {

    return BoundedWindow.TIMESTAMP_MAX_VALUE;

  }



  @Override

  protected Trigger getContinuationTrigger(List<Trigger> continuationTriggers) {

    return this;

  }



  @Override

  public String toString() {

    return "AfterSynchronizedProcessingTime.pastFirstElementInPane()";

  }



  @Override

  public boolean equals(Object obj) {

    return this == obj || obj instanceof AfterSynchronizedProcessingTime;

  }



  @Override

  public int hashCode() {

    return Objects.hashCode(AfterSynchronizedProcessingTime.class);

  }

}